Display Panel and Display Device Comprising the Same

Abstract

The present specification discloses a display panel and a display device including the same. The display panel may include: an insulating layer arranged on a substrate; a bank and a contact electrode arranged to be spaced apart from each other on the insulating layer; a first electrode arranged on the bank; a passivation layer including a first hole exposing an upper surface of the contact electrode and a second hole exposing an upper surface of the first electrode; a light-emitting element arranged on the first electrode; a second electrode arranged on the light-emitting element; a first optical layer surrounding the light-emitting element; and a second optical layer arranged on a side of the first optical layer, wherein the second electrode may come into contact with the upper surface of the contact electrode through a contact hole formed in the second optical layer and the first hole of the passivation layer.

What is claimed is: 
     
         1 . A display panel comprising:
 an insulating layer on a substrate;   a bank and a contact electrode that are spaced apart from each other on the insulating layer;   a first electrode on the bank;   a passivation layer including a first hole exposing an upper surface of the contact electrode and a second hole exposing an upper surface of the first electrode;   a light-emitting element on the first electrode;   a second electrode on the light-emitting element;   a first optical layer surrounding the light-emitting element; and   a second optical layer on a side of the first optical layer,   wherein the second electrode is in contact with the upper surface of the contact electrode through a contact hole formed in the second optical layer and the first hole of the passivation layer.   
     
     
         2 . The display panel of  claim 1 , wherein the second optical layer includes an organic insulating material and the passivation layer includes an inorganic insulating material. 
     
     
         3 . The display panel of  claim 1 , wherein the passivation layer includes a first passivation region in contact with the upper surface of the contact electrode, a second passivation region extending from the first passivation region and in contact with a side surface of the contact electrode, and a third passivation region extending from the second passivation region and arranged on the insulating layer; and
 the second optical layer is on the third passivation region.   
     
     
         4 . The display panel of  claim 3 , wherein the first passivation region includes an inner region and an outer region, the second electrode is in the inner region, and the second optical layer is in the outer region. 
     
     
         5 . The display panel of  claim 1 , wherein with respect to a center of the contact electrode, a first inner end of the passivation layer forming the first hole is located at a first distance, a side surface of the second optical layer forming the contact hole is located at a second distance, and a side edge of the contact electrode is located at a third distance; and
 the second distance is greater than the first distance and less than the third distance.   
     
     
         6 . The display panel of  claim 1 , wherein the insulating layer further includes a protrusion and the contact electrode is on the protrusion. 
     
     
         7 . The display panel of  claim 6 , wherein the insulating layer includes an organic insulating material. 
     
     
         8 . The display panel of  claim 1 , wherein the contact electrode includes a first conductive layer, a second conductive layer on the first conductive layer, a third conductive layer on the second conductive layer, and a fourth conductive layer on the third conductive layer; and
 the second conductive layer includes aluminum.   
     
     
         9 . The display panel of  claim 8 , wherein a thickness of the second conductive layer is greater than a thickness of the first conductive layer. 
     
     
         10 . The display panel of  claim 1 , wherein the second electrode covers a first inner end of the passivation layer forming the first hole. 
     
     
         11 . The display panel of  claim 1 , wherein the contact electrode and the first electrode include a plurality of identical conductive layers. 
     
     
         12 . The display panel of  claim 1 , further comprising:
 a signal line between adjacent banks, the signal line including a same metal layer as the first electrode.   
     
     
         13 . The display panel of  claim 1 , further comprising:
 a pixel driving circuit on the substrate; and   a plurality of connection lines electrically connecting the first electrode and the pixel driving circuit.   
     
     
         14 . The display panel of  claim 1 , wherein the light-emitting element is a micro light-emitting diode. 
     
     
         15 . The display panel of  claim 1 , wherein the light-emitting element has a vertical structure. 
     
     
         16 . The display panel of  claim 1 , further comprising:
 a solder pattern in the second hole,   wherein the first electrode and the light-emitting element are electrically connected using the solder pattern.   
     
     
         17 . A display device comprising:
 a display panel;   a polarizing layer on the display panel;   a printed circuit board; and   a flexible circuit board electrically connecting the display panel and the printed circuit board,   wherein the display panel includes an insulating layer on a substrate, a bank and a contact electrode that are spaced apart from each other on the insulating layer, a first electrode on the bank, a passivation layer including a first hole exposing an upper surface of the contact electrode and a second hole exposing an upper surface of the first electrode, a light-emitting element on the first electrode, a second electrode on the light-emitting element, a first optical layer surrounding the light-emitting element, and a second optical layer on a side of the first optical layer, and   wherein the second electrode is in contact with the upper surface of the contact electrode through a contact hole formed in the second optical layer and the first hole of the passivation layer.   
     
     
         18 . The display device of  claim 17 , wherein with respect to a center of the contact electrode, a first inner end of the passivation layer forming the first hole is located at a first distance, a side surface of the second optical layer forming the contact hole is located at a second distance, and a side edge of the contact electrode is located at a third distance; and
 the second distance is greater than the first distance and less than the third distance.   
     
     
         19 . The display device of  claim 17 , wherein the insulating layer further includes a protrusion and the contact electrode is on the protrusion. 
     
     
         20 . The display device of  claim 17 , wherein the second electrode covers a first inner end of the passivation layer forming the first hole.